51235729812 has 36 divisors (see below), whose sum is σ = 129638008500. Its totient is φ = 17062031232.

The previous prime is 51235729807. The next prime is 51235729823. The reversal of 51235729812 is 21892753215.

51235729812 is a `hidden beast` number, since 5 + 1 + 2 + 357 + 298 + 1 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 39821798916 + 11413930896 = 199554^2 + 106836^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 651687 + ... + 726062.

Almost surely, 2^51235729812 is an apocalyptic number.

It is an amenable number.

51235729812 is an abundant number, since it is smaller than the sum of its proper divisors (78402278688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51235729812 is a wasteful number, since it uses less digits than its factorization.

51235729812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378792 (or 1378787 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The spelling of 51235729812 in words is "fifty-one billion, two hundred thirty-five million, seven hundred twenty-nine thousand, eight hundred twelve".